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6th Grade STEM: Fossils and Geologic Time
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6th Grade STEM: Fossils and Geologic Time
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25 Questions

1. Why can't you use absolute dating on a sedimentary rock?

2. During which period did mammals first evolve?

3. Why did scientists use rocks from the moon to determine the earth's age?

4. Describe the appearance of Earth during the Hadean Eon.

5. Which period is known best for the diversification of fish?

6. During which period did humans first evolve?

7. What type of vegetation evolved in response to the Earth's cooling temperatures?

8. Are intrusions and faults younger or older than the layers they cut through?

9. Do rock fossils preserve the actual body part or an porganism?

10. In which type of rock are fossils typically found?

11. What are atoms with the same number of protons but a different number of neutrons called?

12. During which eon did the oceans first form?

13. What type of carbon is radioactive and unstable?

14. What are 3 types of fossils that preserve the actuaL body parts of an organism?

15. Will younger fossils have more or less parent material?

16. Which types of fossils preserve the soft tissue of an organism?

17. Approximately how old is Earth?

18. Why is soft tissue not preserved during fossilization?

19. Explain the origin of whales.

20. What percentage of the earth's history does Precambrian cover?

21. What types of isotopes are unstable and radioactive?

22. How is geologic time divided by scientists?

23. What organisms where the first vertebrates and during which period did they appear?

24. Contrast the plant life during the Jurassic and Cretaceous Periods

25. Contrast the dinosaurs during the Jurassic and Cretaceous Periods.

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